CVE-2026-103242

HIGHPre-NVD 7.17.1—
EchelonGraph scoreHIGH confidence

Score 7.1 from GitHub Security Advisory (severity: HIGH) published 2026-09-30. A secondary CVSS source baseline 7.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 5 sources updated this week
7.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.1%CVSS: 7.1Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

A heap-based buffer overflow flaw was found in rpm. RPMTAG_FILESIGNATURES in a crafted, unsigned RPM package's main header is declared with the wrong header type, causing hex2binv() to allocate a one-byte buffer and then write the tag's attacker-controlled, hex-decoded content — of attacker-chosen length — past the end of that allocation. This is reachable via rpm2cpio, rpm2archive, and rpm -qlvp on an untrusted package.

CVSS v3
7.1
EG Score
7.1HIGHhigh confidence
EG Risk
32
EG Risk 32/100CISA SSVC

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity71% × 45%
Exploitation0% × 40%
Automatability0% × 15%
CISA SSVC: Track at low or medium mission impact; Track* at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.1%
EPSS %ILE
1st
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

September 30, 2026

Last Modified

September 30, 2026

Advisory Details (2)

Auto-updated Sep 30, 2026
Patch available. Sources: redhat.
redhat

2543866 – (CVE-2026-103242) CVE-2026-103242 rpm: Heap-based buffer overflow write in hex2binv() via a mistyped RPMTAG_FILESIGNATURES header tag

https://bugzilla.redhat.com/show_bug.cgi?id=2543866
redhat Patch Available

CVE-2026-103242 - Red Hat Customer Portal

Affected: Red Hat Enterprise Linux 8 or OpenShift Container Platform 4, is affected by this vulnerability and a fix may be released to a

https://access.redhat.com/security/cve/CVE-2026-103242

Vendor Advisories for CVE-2026-103242(2)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(3 across 3 ecosystems)
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
rpm4.18.0+dfsg-1 ... 6.1.0-1 (20 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
rpm4.20.1+dfsg-3, 6.0.0-1, 6.0.0-2, 6.0.1-1, 6.1.0-1
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
rpm4.20.1+dfsg-3, 6.0.0-1, 6.0.0-2, 6.0.1-1, 6.1.0-1
  • every version on: no fix on record
—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 26× in last 7d / 26× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-10-05 00:34 UTCEG score recompute
  2. 2026-10-05 00:34 UTCVendor advisory
  3. 2026-10-05 00:34 UTCGHSA enrichment
  4. 2026-10-04 23:21 UTCEPSS rescore
  5. 2026-10-04 11:41 UTCVendor advisory
  6. 2026-10-04 11:41 UTCGHSA enrichment
  7. 2026-10-03 22:48 UTCEG score recompute
  8. 2026-10-03 22:48 UTCVendor advisory
  9. 2026-10-03 22:48 UTCGHSA enrichment
  10. 2026-10-03 14:25 UTCEPSS rescore
  11. 2026-10-03 09:55 UTCVendor advisory
  12. 2026-10-03 09:54 UTCGHSA enrichment
  13. 2026-10-02 20:59 UTCEG score recompute
  14. 2026-10-02 20:59 UTCGHSA enrichment
  15. 2026-10-02 08:06 UTCEG score recompute
  16. 2026-10-02 08:06 UTCGHSA enrichment
  17. 2026-10-01 19:49 UTCEPSS rescore
  18. 2026-10-01 19:13 UTCGHSA enrichment
  19. 2026-10-01 06:18 UTCGHSA enrichment
  20. 2026-09-30 17:25 UTCEG score recompute
  21. 2026-09-30 17:25 UTCGHSA enrichment
  22. 2026-09-30 16:41 UTCEG score recompute
  23. 2026-09-30 16:41 UTCGHSA enrichment
  24. 2026-09-30 12:21 UTCEG score recompute
  25. 2026-09-30 11:58 UTCEG score recompute
Show 1 more
  1. 2026-09-30 11:57 UTCMITRE cvelistV5first tracked

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2026-103242?
CVE-2026-103242 is a high vulnerability published on September 30, 2026. A heap-based buffer overflow flaw was found in rpm. RPMTAG_FILESIGNATURES in a crafted, unsigned RPM package's main header is declared with the wrong header type, causing hex2binv() to allocate a one-byte buffer and then write the tag's attacker-controlled, hex-decoded content — of attacker-chosen…
When was CVE-2026-103242 disclosed?
CVE-2026-103242 was first published on September 30, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-103242 actively exploited?
CVE-2026-103242 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.1% probability of exploitation in the next 30 days (1st percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-103242?
CVE-2026-103242 has a CVSS base score of 7.1 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-103242?
A fix for CVE-2026-103242 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-103242 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-103242

Explore →

Is Your Infrastructure Affected by CVE-2026-103242?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Book a Demo →Browse All CVEs